Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Goes well past the annotations (which only mark it non-read-only, open-world, non-idempotent, non-destructive) by disclosing that tokens are single-use, expire in 10 minutes, that one token maps to exactly one file, the 1..20 count scaling, and the required curl/receipt/fileRef workflow. It even handles the failure mode, which annotations cannot express.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core purpose and workflow, and every sentence carries real information (expiry, count, receipt, fallback). It is dense and slightly run-on in the middle, but no sentence is filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema, the description still describes the return shape (descriptors containing a curl line and a receipt with fileRef) and the full call chain. The remaining gap is that three of four inputs and any auth expectations are undocumented, which is significant for a tool whose schema coverage is 0%.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description must carry all four parameters. It explains count well (one descriptor per file, range 1..20) but leaves apiKey, filename, and mimeType completely undefined in both schema and description, including whether apiKey is auth or an override.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a precise verb and resource (get one-time upload links for files) plus the execution environment it is built for (shell with network access). It contrasts itself with uploadDocument explicitly, so an agent can distinguish it from siblings without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Gives explicit use conditions (you can run shell commands with network access) and explicit fallbacks (curl network error or user wants to pick a file -> uploadDocument, or ask for an https:// link). It also names the downstream tools to call with the resulting fileRef, leaving nothing to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.